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Herbert Valerio Riedel authored
Unfortunately, this requires introducing a couple of .hs-boot files to break up import cycles (mostly to provide class & typenames in order to be able to write type signatures). This does not yet re-export `(<>)` from Prelude (while the class-name `Semigroup` is reexported); that will happen in a future commit. Test Plan: local ./validate passed Reviewers: ekmett, austin, bgamari, erikd, RyanGlScott Reviewed By: ekmett, RyanGlScott GHC Trac Issues: #14191 Differential Revision: https://phabricator.haskell.org/D3927
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